CN114882843A

CN114882843A - Method and device for compensating brightness of display panel and computer readable storage medium

Info

Publication number: CN114882843A
Application number: CN202210688756.4A
Authority: CN
Inventors: 张肖; 郭星灵; 谭小平; 朱修剑
Original assignee: Kunshan Govisionox Optoelectronics Co Ltd; Hefei Visionox Technology Co Ltd
Current assignee: Kunshan Govisionox Optoelectronics Co Ltd; Hefei Visionox Technology Co Ltd
Priority date: 2022-06-17
Filing date: 2022-06-17
Publication date: 2022-08-09
Anticipated expiration: 2042-06-17
Also published as: CN114882843B

Abstract

The embodiment of the application provides a brightness compensation method and device of a display panel and a computer readable storage medium, wherein the method comprises the following steps: acquiring the actual brightness of a plurality of sub-display areas when the display panel displays M first color pictures with different gray scales, wherein M is an integer larger than 1; determining a target gray scale according to the deviation result of the actual brightness of a plurality of sub-display areas and first target brightness corresponding to the M gray scales respectively when the first color image with the M gray scales is displayed, wherein the first target brightness is the target brightness of a first color sub-pixel; acquiring actual brightness of a plurality of sub-display areas when the display panel displays a second color picture of the target gray scale; and determining the corresponding data voltage compensation amount of each sub-display area when the gray scales are at least M according to the actual brightness of the sub-display areas when the first color picture with the M gray scales is displayed and the actual brightness of the sub-display areas when the second color picture with the target gray scale is displayed. The method and the device can reduce time and cost spent in the DeMura process.

Description

Brightness compensation method and device of display panel and computer readable storage medium

Technical Field

The present application relates to the field of display technologies, and in particular, to a method and an apparatus for compensating brightness of a display panel, and a computer-readable storage medium.

Background

Due to manufacturing process limitations, the display panel may generate circuit inconsistencies at the sub-pixel level. Such non-uniformity is represented on the display, i.e. a whole or local display non-uniformity, represented by a block, a sand, a dot, etc., and such non-uniformity is collectively referred to as Mura (referring to a phenomenon that the brightness of the display panel is non-uniform, causing various marks). While the Mura calibration for display panels is commonly referred to as DeMura.

However, as the inventor of the present application studies, the current DeMura process takes a long time and is costly.

Disclosure of Invention

The embodiment of the application provides a brightness compensation method and device for a display panel and a computer-readable storage medium, which can reduce the time and cost spent in a DeMura process while ensuring the DeMura compensation effect.

In a first aspect, an embodiment of the present application provides a method for compensating brightness of a display panel, where the method includes: acquiring the actual brightness of a plurality of sub-display areas when the display panel displays M first color pictures with different gray scales, wherein M is an integer larger than 1; determining a target gray scale according to the deviation result of the actual brightness of a plurality of sub-display areas and first target brightness corresponding to the M gray scales respectively when the first color image with the M gray scales is displayed, wherein the first target brightness is the target brightness of a first color sub-pixel; acquiring actual brightness of a plurality of sub-display areas when the display panel displays a second color picture of the target gray scale; and determining the corresponding data voltage compensation amount of each sub-display area when the gray scales are at least M according to the actual brightness of the sub-display areas when the first color picture with the M gray scales is displayed and the actual brightness of the sub-display areas when the second color picture with the target gray scale is displayed.

According to an embodiment of the first aspect of the present application, the method may further comprise: acquiring actual brightness of a plurality of sub-display areas when the display panel displays a third color picture of the target gray scale; determining the data voltage compensation amount corresponding to each sub-display area in at least M gray scales according to the actual brightness of the sub-display areas in the first color picture of the M gray scales and the actual brightness of the sub-display areas in the second color picture of the target gray scale, and specifically comprises the following steps: determining the corresponding data voltage compensation quantity of each sub-display area when the gray scales are at least M according to the actual brightness of the sub-display areas when the first color picture of the gray scales is M, the actual brightness of the sub-display areas when the second color picture of the target gray scale is M, and the actual brightness of the sub-display areas when the third color picture of the target gray scale is M; the target gray scale comprises N gray scales, wherein N is smaller than M and is a positive integer.

Therefore, on one hand, the first color sub-pixels with larger brightness influence still adopt a plurality of first color pictures with different gray scales for DeMura compensation, so that better DeMura compensation effect can be ensured. On the other hand, the second color sub-pixel with less brightness influence adopts the second color picture with a small amount of gray scale for DeMura compensation, and the third color sub-pixel with less brightness influence also adopts the third color picture with a small amount of gray scale for DeMura compensation, so that the number of pictures shot in the DeMura process can be reduced, the shooting time is shortened, and the time and the cost spent in the DeMura process can be reduced.

According to any one of the foregoing embodiments of the first aspect of the present application, determining the target gray scale according to the deviation result of the actual brightness of the plurality of sub-display areas when the first color screen has the M gray scales and the first target brightness corresponding to the M gray scales respectively may specifically include: calculating the standard deviation or variance of the actual brightness of the sub-display areas and the first target brightness corresponding to the ith gray scale when the first color picture of the ith gray scale is displayed for any ith gray scale in the M gray scales; and according to the sorting from large to small, taking the gray scales corresponding to the first Q standard deviations or variances as target gray scales, wherein Q is not more than M and is an integer.

Therefore, by calculating the standard deviation or variance of the actual brightness of the sub-display area in the first color picture with the M gray scales and the first target brightness corresponding to the M gray scales respectively and selecting the gray scale with the larger standard deviation or variance as the target gray scale, the gray scale with the largest influence on the brightness or the gray scale with the more serious mura degree can be accurately determined from the M gray scales, and then the DeMura compensation is carried out on the gray scale with the more serious mura degree, so that the good DeMura compensation effect can be ensured to a greater extent while the number of pictures shot in the DeMura process is reduced and the shooting time is shortened.

In an embodiment of the first aspect of the present application, Q is 1.

In this way, since the second color sub-pixel and/or the third color sub-pixel with less influence on the brightness only adopts the second color picture and/or the third color picture with one gray scale for the DeMura compensation, the number of pictures shot in the DeMura process can be reduced to a greater extent, the shooting time can be shortened, and the time and the cost spent in the DeMura process can be reduced to a greater extent.

According to any one of the foregoing embodiments of the first aspect of the present application, the standard deviation of the actual luminance of the plurality of sub-display areas at the time of the first color screen at the ith gray scale and the first target luminance corresponding to the ith gray scale is calculated according to the following expression:

where σ denotes a standard deviation, N denotes the number of sub-display regions in the display panel, and x _j The actual brightness of the jth sub-display section in the first color picture representing the ith gray scale,

the first target brightness corresponding to the ith gray scale is represented.

Therefore, the standard deviation of the actual brightness of the sub-display area in the first color picture with the M gray scales and the first target brightness corresponding to the M gray scales is calculated through the expression, the gray scale with the larger standard deviation is selected as the target gray scale, the gray scale with the largest influence on the brightness or the gray scale with the more serious mura degree can be accurately determined from the M gray scales, and then the DeMura compensation is carried out on the gray scale with the more serious mura degree, so that the good DeMura compensation effect can be ensured to a greater extent while the number of pictures shot in the DeMura process is reduced and the shooting time is shortened.

According to any one of the foregoing embodiments of the first aspect of the present application, the variance between the actual luminance of the plurality of sub-display areas at the time of the first color screen at the ith gray scale and the first target luminance corresponding to the ith gray scale is calculated according to the following expression:

wherein s is ² Representing variance, N representing the number of sub-display regions in the display panel, x ₁ 、x ₂ 、x ₃ And x _N Respectively representing the actual brightness of the 1 st sub-display region, the 2 nd sub-display region, the 3 rd sub-display region and the nth sub-display region when the first color picture of the ith gray scale,

the first target brightness corresponding to the ith gray scale is represented.

Therefore, the variance of the actual brightness of the sub-display area in the first color picture with the M gray scales and the variance of the first target brightness corresponding to the M gray scales are calculated through the expression, the gray scale with the larger variance is selected as the target gray scale, the gray scale with the largest influence on the brightness or the gray scale with the serious mura degree can be accurately determined from the M gray scales, and then the DeMura compensation is carried out on the gray scale with the serious mura degree, so that the good DeMura compensation effect can be ensured to a large extent while the number of pictures shot in the DeMura process is reduced and the shooting time is shortened.

According to any one of the foregoing embodiments of the first aspect of the present application, determining, according to the actual brightness of the plurality of sub-display regions in the first color screen with M gray scales and the actual brightness of the plurality of sub-display regions in the second color screen with the target gray scale, a data voltage compensation amount corresponding to each sub-display region in at least M gray scales may specifically include: calculating the difference value between the actual brightness of each sub-display area in the first color picture of the ith gray scale and the first target brightness corresponding to the ith gray scale to obtain the brightness difference of the first color sub-pixels in each sub-display area for any ith gray scale in the M gray scales; determining the data voltage compensation quantity of the first color sub-pixel in each sub-display area at the ith gray scale according to the predetermined corresponding relation between the brightness and the data voltage and the brightness difference of the first color sub-pixel in each sub-display area; calculating the difference value between the actual brightness of each sub-display area in the second color picture of the target gray scale and the second target brightness corresponding to the target gray scale to obtain the brightness difference of the second color sub-pixels in each sub-display area, wherein the second target brightness is the target brightness of the second color sub-pixels; determining the data voltage compensation quantity of the second color sub-pixels in each sub-display area when the target gray scale is achieved according to the predetermined corresponding relation between the brightness and the data voltage and the brightness difference of the second color sub-pixels in each sub-display area; and taking the data voltage compensation quantity of the second color sub-pixel in each sub-display area in the target gray scale as the data voltage compensation quantity of the second color sub-pixel in each sub-display area in at least M gray scales.

In this way, for the second color sub-pixel with less influence on the brightness, the data voltage compensation amount of the second color sub-pixel in each sub-display region at the target gray scale is used as the data voltage compensation amount of the second color sub-pixel in each sub-display region at least M gray scales, so that the number of second color pictures shot in the DeMura process can be reduced, the shooting time can be shortened, and the time and the cost spent in the DeMura process can be reduced.

According to any of the foregoing embodiments of the first aspect of the present application, before obtaining the actual brightness of the plurality of sub-display regions when the display panel displays the second color screen of the target gray scale, the method may further include: acquiring actual brightness of a plurality of sub-display areas when a display panel displays a red picture with a preset gray scale and actual brightness of a plurality of sub-display areas when a blue picture with a preset gray scale is displayed; calculating a first deviation result of actual brightness of a plurality of sub-display areas in a red picture with a preset gray scale and second target brightness corresponding to the preset gray scale, wherein the second target brightness is the target brightness of a second color sub-pixel; calculating a second deviation result of the actual brightness of the plurality of sub-display areas when the blue picture with the preset gray scale is displayed and a third target brightness corresponding to the preset gray scale, wherein the third target brightness is the target brightness of a third color sub-pixel; when the first deviation result is larger than or equal to the second deviation result, determining the red picture as a second color picture; and when the first deviation result is smaller than the second deviation result, determining the blue picture as a second color picture.

Therefore, by calculating the first deviation result of the red image and the second deviation result of the blue image and comparing the first deviation result with the second deviation result, the second color sub-pixel with larger brightness influence or the second color sub-pixel with larger mura degree influence can be accurately determined, and then only the first color sub-pixel with the largest brightness influence and the second color sub-pixel with the larger brightness influence are subjected to DeMura compensation, so that the good DeMura compensation effect can be greatly ensured while the number of images shot in the DeMura process is reduced and the shooting time is shortened.

According to any of the foregoing embodiments of the first aspect of the present application, the first color frame may include a green frame, the second color frame may include any one of a red frame or a blue frame, and the target gray scale may include M gray scales.

Therefore, on one hand, the first color sub-pixel still adopts the first color pictures with M different gray scales for DeMura compensation, and the second color sub-pixel still adopts the second color pictures with M different gray scales for DeMura compensation, so that better DeMura compensation effect can be ensured. On the other hand, the third color picture of the third color sub-pixel with less influence on the brightness is not collected, namely, only the first color picture and the second color picture are shot, so that the number of pictures shot in the DeMura process can be reduced, the shooting time is shortened, and the time and the cost spent in the DeMura process can be reduced.

In a second aspect, an embodiment of the present application provides a brightness compensation apparatus for a display panel, where a display area of the display panel includes a plurality of sub-display areas, the apparatus including: the first acquisition module is used for acquiring the actual brightness of a plurality of sub-display areas when the display panel displays M first color pictures with different gray scales, wherein M is an integer greater than 1; the first determining module is used for determining a target gray scale according to a deviation result of actual brightness of a plurality of sub display areas and first target brightness corresponding to the M gray scales when the first color image with the M gray scales is displayed, wherein the first target brightness is the target brightness of a first color sub pixel; the second acquisition module is used for acquiring the actual brightness of the plurality of sub-display areas when the display panel displays a second color picture of the target gray scale; and the second determining module is used for determining the data voltage compensation quantity corresponding to each sub-display area in at least M gray scales according to the actual brightness of the sub-display areas in the first color picture of the M gray scales and the actual brightness of the sub-display areas in the second color picture of the target gray scale.

In a third aspect, an embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the brightness compensation method for a display panel provided in the first aspect.

The brightness compensation method, the brightness compensation device and the computer-readable storage medium of the display panel of the embodiment of the application acquire actual brightness of a plurality of sub-display areas when the display panel displays M first color pictures with different gray scales, wherein M is an integer greater than 1; determining a target gray scale according to the deviation result of the actual brightness of a plurality of sub-display areas and first target brightness corresponding to the M gray scales respectively when the first color image with the M gray scales is displayed, wherein the first target brightness is the target brightness of a first color sub-pixel; acquiring actual brightness of a plurality of sub-display areas when the display panel displays a second color picture of the target gray scale; and determining the corresponding data voltage compensation amount of each sub-display area when the gray scales are at least M according to the actual brightness of the sub-display areas when the first color picture with the M gray scales is displayed and the actual brightness of the sub-display areas when the second color picture with the target gray scale is displayed. On one hand, the first color sub-pixel with larger brightness influence still adopts a plurality of first color pictures with different gray scales to carry out DeMura compensation, so that better DeMura compensation effect can be ensured. On the other hand, the target gray scale is determined by analyzing the brightness deviation result of the first color picture with M gray scales, the DeMura compensation is carried out on the second color picture of the second color sub-pixel with smaller brightness influence by adopting a small amount of target gray scale, and/or the third color picture of the third color sub-pixel with smaller brightness influence is not shot, so that the number of pictures shot in the DeMura process can be reduced, the shooting time is shortened, and the time and the cost spent in the DeMura process can be reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic top view of a display panel according to an embodiment of the present disclosure;

fig. 2 is a schematic flowchart illustrating a brightness compensation method for a display panel according to an embodiment of the present disclosure;

FIG. 3 is a flowchart illustrating a step S102 of the brightness compensation method for the display panel shown in FIG. 2;

FIG. 4 is a flowchart illustrating a step S104 of the brightness compensation method of the display panel shown in FIG. 2;

fig. 5 is a schematic flowchart illustrating a brightness compensation method for a display panel according to an embodiment of the present disclosure;

fig. 6 is a schematic flowchart illustrating a luminance compensation method for a display panel according to an embodiment of the present disclosure;

fig. 7 is a schematic flowchart illustrating a brightness compensation method for a display panel according to an embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of a brightness compensation apparatus of a display panel according to an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

Features and exemplary embodiments of various aspects of the present application will be described in detail below, and in order to make objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are intended to be illustrative only and are not intended to be limiting. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples thereof.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

Before explaining the technical solutions provided by the embodiments of the present application, in order to facilitate understanding of the embodiments of the present application, the present application first specifically explains the problems existing in the prior art:

due to manufacturing process limitations, the display panel may generate circuit inconsistencies at the sub-pixel level. The non-uniformity is shown in the display, i.e. a whole or local display non-uniformity, which is shown in a block shape, a sand shape, a dot shape, etc., and the non-uniformity is collectively called Mura (referring to the phenomenon that the brightness of the display panel is non-uniform, causing various marks). Currently, the limitation of Mura is one of the main factors in the production yield of display panels (such as OLED display panels). While the Mura calibration for display panels is commonly referred to as DeMura.

In the design of the DeMura algorithm, the accuracy of the front-end shooting brightness data greatly influences the compensation effect of the DeMura algorithm. Therefore, the shot pictures need to cover more gray scales and mura forms as much as possible to ensure the compensation effect, and the shot pictures are shot by generally selecting 6 gray scales of three colors of red, green and blue with low, medium and high brightness, namely 18 pictures in total. The time cost is also increased by such a large number of shots.

In view of the above research by the inventor, embodiments of the present application provide a method and an apparatus for compensating brightness of a display panel, and a computer-readable storage medium, which can solve the technical problems of long time spent by the DeMura process and high cost in the related art.

The technical idea of the embodiment of the application is as follows: on one hand, the first color sub-pixel with larger brightness influence still adopts M first color pictures with different gray scales to carry out DeMura compensation, so that better DeMura compensation effect can be ensured. On the other hand, the target gray scale is determined by analyzing the brightness deviation result of the first color picture with M gray scales, the DeMura compensation is carried out on the second color picture of the second color sub-pixel with smaller brightness influence by adopting a small amount of target gray scale, and/or the third color picture of the third color sub-pixel with smaller brightness influence is not shot, so that the number of pictures shot in the DeMura process is reduced, the shooting time is shortened, and the time and the cost spent in the DeMura process are reduced.

First, a method for compensating brightness of a display panel according to an embodiment of the present application will be described.

Fig. 1 is a schematic top view of a display panel according to an embodiment of the present disclosure. As shown in fig. 1, the display region of the display panel 10 includes a plurality of sub-display regions a, and each sub-display region a may include at least one sub-pixel.

Fig. 2 is a flowchart illustrating a brightness compensation method for a display panel according to an embodiment of the present disclosure. As shown in fig. 2, the method may include the steps of:

s101, acquiring actual brightness of a plurality of sub-display areas when a display panel displays M first color pictures with different gray scales, wherein M is an integer larger than 1;

s102, determining target gray scales according to deviation results of actual brightness of a plurality of sub-display areas and first target brightness corresponding to the M gray scales respectively when the first color picture of the M gray scales is displayed, wherein the first target brightness is target brightness of a first color sub-pixel;

s103, acquiring actual brightness of a plurality of sub-display areas when the display panel displays a second color picture of the target gray scale;

s104, determining the data voltage compensation amount corresponding to each sub-display area in at least M gray scales according to the actual brightness of the sub-display areas in the first color picture of the M gray scales and the actual brightness of the sub-display areas in the second color picture of the target gray scale.

Specific implementations of the above steps will be described in detail below.

According to the brightness compensation method of the display panel, the actual brightness of a plurality of sub-display areas when the display panel displays M first color pictures with different gray scales is obtained, wherein M is an integer larger than 1; determining a target gray scale according to deviation results of actual brightness of a plurality of sub display areas in a first color picture with M gray scales and first target brightness corresponding to the M gray scales respectively, wherein the first target brightness is the target brightness of a first color sub pixel; acquiring actual brightness of a plurality of sub-display areas when the display panel displays a second color picture of the target gray scale; and determining the corresponding data voltage compensation amount of each sub-display area in at least M gray scales according to the actual brightness of the sub-display areas in the first color picture of the M gray scales and the actual brightness of the sub-display areas in the second color picture of the target gray scale. On one hand, the first color sub-pixel with larger brightness influence still adopts M first color pictures with different gray scales to carry out DeMura compensation, so that better DeMura compensation effect can be ensured. On the other hand, the target gray scale is determined by analyzing the brightness deviation result of the first color picture with M gray scales, the DeMura compensation is carried out on the second color picture of the second color sub-pixel with smaller brightness influence by adopting a small amount of target gray scale, and/or the third color picture of the third color sub-pixel with smaller brightness influence is not shot, so that the number of pictures shot in the DeMura process can be reduced, the shooting time is shortened, and the time and the cost spent in the DeMura process can be reduced.

Specific implementations of the above steps are described below.

Firstly, S101, the actual brightness of a plurality of sub-display areas when the display panel displays M first color pictures with different gray scales is obtained, wherein M is an integer larger than 1.

The specific number of M may be flexibly adjusted according to actual conditions, which is not limited in the embodiments of the present application. As mentioned above, for example, M may be equal to 6. That is, in some examples, the first color frame with 6 different gray levels may be selected for DeMura compensation.

In S101, for any ith gray scale in the M gray scales, the display panel may display a first color picture of the ith gray scale, and then may acquire actual brightness of the plurality of sub-display regions in the first color picture of the ith gray scale through an optical measurement device such as a color analyzer. For example, the display area of the display panel 10 includes 100 sub-display areas a, and then the actual brightness of the 100 sub-display areas a may be collected by the optical measurement device. It is easy to understand that the actual brightness of the 100 sub-display regions a can be different or partially the same at the same gray level, for example, the actual brightness of several sub-display regions a is the same.

In the embodiment of the present application, the first color picture may be a picture corresponding to the first color sub-pixel having the largest influence on the brightness. The research of the inventor of the application finds that the proportion of green is the highest in white light, and the influence on human eye feeling is the greatest. Thus, the first color picture may be a green picture. When displaying a green picture, for example, other color sub-pixels except the green sub-pixel in the display panel do not emit light, and only the green sub-pixel emits light, thereby achieving the effect of displaying a green pure color picture.

The above is a specific implementation of S101, and a specific implementation of S102 is described below.

S102, determining a target gray scale according to deviation results of actual brightness of a plurality of sub display areas and first target brightness corresponding to the M gray scales respectively when the first color image with the M gray scales is displayed, wherein the first target brightness is target brightness of a first color sub pixel.

The target brightness (i.e. the first target brightness) of the first color sub-pixel at each gray level is known and can be predetermined. It is easy to understand that the target brightness of the first color sub-pixel at different gray scales can be different, i.e. the target brightness changes with the change of gray scale.

Fig. 3 is a flowchart illustrating the step S102 in the brightness compensation method of the display panel shown in fig. 2. As shown in fig. 3, according to some embodiments of the present application, optionally, S102 may specifically include the following steps S301 and S302.

S301, calculating standard deviation or variance of actual brightness of a plurality of sub-display areas and first target brightness corresponding to the ith gray scale in the first color picture of the ith gray scale for any ith gray scale in the M gray scales.

Assuming that the display area of the display panel 10 includes N sub-display areas, in S301, for any ith gray scale in the M gray scales, a standard deviation or a variance between actual brightness of the 1 st sub-display area to the nth sub-display area in the first color screen of the ith gray scale and first target brightness corresponding to the ith gray scale may be calculated.

S302, according to the sorting from big to small, taking the gray scales corresponding to the Q standard deviations or variances before the sorting as target gray scales, wherein Q is not more than M and is an integer. That is, a gray level corresponding to a larger standard deviation or a larger variance is selected from the M gray levels as a target gray level. For example, when M is 6, Q may be any one of 1 to 6.

In some specific embodiments, optionally, Q ═ 1. That is, the gray scale corresponding to the largest standard deviation or the largest variance among the M gray scales may be selected as the target gray scale.

In some embodiments, the target gray levels may optionally include M gray levels. For example, when M is 6, Q is 6. It is easily understood that the display panel may further include a second color sub-pixel and a third color sub-pixel. During DeMura compensation, shooting of a third color picture with small influence on brightness can be omitted, and finally only a first color picture with M gray scales and a second color picture with M gray scales are shot.

For ease of understanding, M ═ 6 is described below with reference to table 1.

TABLE 1

As can be seen from table 1, in the related art, it takes 54 seconds to shoot 18 frames in total for 6 gray-scale shots of three colors of red, green and blue with low, medium and high brightness. In some embodiments of the present application, only the first color picture with 6 gray scales and the second color picture with 6 gray scales need to be photographed for 36 seconds, and the compensation effect is similar to that of the related art, so that the number of pictures photographed in the DeMura process can be reduced, the photographing time can be shortened, and the time and cost spent in the DeMura process can be reduced.

According to some embodiments of the present application, optionally, a standard deviation of actual luminances of the plurality of sub display areas at the time of the first color screen of the ith gray scale and a first target luminance corresponding to the ith gray scale may be calculated according to the following expression:

the first target brightness corresponding to the ith gray scale is represented.

Therefore, the standard deviation of the actual brightness of the sub-display area and the first target brightness corresponding to the M gray scales respectively when the M gray scales are used for the first color picture is calculated through the expression (1), the gray scale with the larger standard deviation is selected as the target gray scale, the gray scale with the largest influence on the brightness or the gray scale with the more serious mura degree can be accurately determined from the M gray scales, and then the DeMura compensation is carried out on the gray scale with the more serious mura degree, so that the good DeMura compensation effect can be ensured to a greater extent while the number of pictures shot in the DeMura process is reduced and the shooting time is shortened.

According to some embodiments of the present application, optionally, a variance of actual luminance of the plurality of sub-display areas at the time of the first color screen of the ith gray scale and the first target luminance corresponding to the ith gray scale may be calculated according to the following expression:

the first target brightness corresponding to the ith gray scale is represented.

Therefore, the variance of the actual brightness of the sub-display area and the variance of the first target brightness corresponding to the M gray scales respectively when the first color picture with the M gray scales is obtained through the expression (2), the gray scale with the larger variance is selected as the target gray scale, the gray scale with the largest influence on the brightness or the gray scale with the larger mura degree can be accurately determined from the M gray scales, and the DeMura compensation is subsequently performed on the gray scale with the larger mura degree, so that the good DeMura compensation effect can be greatly ensured while the number of pictures shot in the DeMura process is reduced and the shooting time is shortened.

The above is a specific implementation of S102, and a specific implementation of S103 is described below.

S103, acquiring the actual brightness of the sub-display areas when the display panel displays the second color picture of the target gray scale.

In S103, the display panel may display the second color picture of the target gray scale, and then the actual brightness of the sub-display areas in the second color picture of the target gray scale may be collected by an optical measurement device such as a color analyzer.

The above is a specific implementation of S103, and a specific implementation of S104 is described below.

Fig. 4 is a flowchart illustrating the step S104 in the brightness compensation method of the display panel shown in fig. 2. As shown in fig. 4, according to some embodiments of the present application, optionally, S104 may specifically include the following steps S401 to S405.

S401, for any ith gray scale in the M gray scales, calculating a difference value between actual brightness of each sub-display area in the first color picture of the ith gray scale and first target brightness corresponding to the ith gray scale to obtain brightness difference of the first color sub-pixels in each sub-display area.

As described above, when the display panel displays the first color picture of the ith gray scale, the actual brightness of each sub-display area can be acquired by the optical measurement device, and because only the first color sub-pixels emit light, the acquired actual brightness is the actual brightness of the first color sub-pixels in each sub-display area. In addition, the first target brightness corresponding to the ith gray scale may be predetermined. Then, in S401, the actual brightness of each sub-display area at the ith gray scale is different from the first target brightness corresponding to the ith gray scale, so as to obtain the brightness difference of the first color sub-pixels in each sub-display area.

S402, determining the data voltage compensation quantity of the first color sub-pixel in each sub-display area during the ith gray scale according to the predetermined corresponding relation between the brightness and the data voltage and the brightness difference of the first color sub-pixel in each sub-display area.

Where the luminance is related to the data voltage, for example, the luminance gradually decreases (i.e., is negatively related) as the data voltage increases. Accordingly, the correspondence between the luminance and the data voltage may be predetermined. For example, the correspondence between the brightness and the data voltage may be determined through experiments, historical data simulation, or model training, which is not limited in this embodiment of the present application.

In S402, after obtaining the luminance difference of the first color sub-pixel in each sub-display region, the data voltage compensation amount corresponding to the luminance difference may be determined according to the predetermined correspondence between the luminance and the data voltage. Therefore, the data voltage compensation quantity of the first color sub-pixel in each sub-display area when the M gray scales are obtained.

For example, when M is equal to 6, for 250 gray scales except 6 tie points (gray scales) in 0 to 255, the data voltage compensation amount of the first color sub-pixel in each sub-display region for the M gray scales may be processed based on a linear interpolation algorithm to obtain the data voltage compensation amount of the first color sub-pixel in each sub-display region for the other 250 gray scales.

S403, calculating a difference value between the actual brightness of each sub-display area in the second color picture of the target gray scale and a second target brightness corresponding to the target gray scale to obtain a brightness difference of a second color sub-pixel in each sub-display area, wherein the second target brightness is the target brightness of the second color sub-pixel.

When the display panel displays the second color picture of the target gray scale, the actual brightness of each sub-display area can be acquired through optical measurement equipment, and because only the second color sub-pixels emit light, the acquired actual brightness is the actual brightness of the second color sub-pixels in each sub-display area. In addition, the corresponding second target brightness of the second color sub-pixel at the target gray scale can also be predetermined. Then, in S403, the actual brightness of each sub-display area at the target gray scale is different from the second target brightness corresponding to the second color sub-pixel at the target gray scale, so as to obtain the brightness difference of the second color sub-pixel in each sub-display area.

S404, determining the data voltage compensation quantity of the second color sub-pixels in each sub-display area when the target gray scale is achieved according to the corresponding relation between the predetermined brightness and the data voltage and the brightness difference of the second color sub-pixels in each sub-display area.

In S404, after obtaining the luminance difference of the second color sub-pixel in each sub-display region, the data voltage compensation amount corresponding to the luminance difference may be determined according to the predetermined correspondence between the luminance and the data voltage. Therefore, the data voltage compensation quantity of the second color sub-pixel in each sub-display area during the target gray scale is obtained.

S405, taking the data voltage compensation quantity of the second color sub-pixel in each sub-display area in the target gray scale as the data voltage compensation quantity of the second color sub-pixel in each sub-display area in at least M gray scales. For example, when the target gray scale has only one gray scale, the data voltage compensation amount of the second color sub-pixel in each sub-display area at the target gray scale can be directly used as the data voltage compensation amount of the second color sub-pixel in each sub-display area at the gray scales of 0-255. When the target gray scale has a plurality of gray scales, the data voltage compensation amount of the second color sub-pixel in each sub-display area during the target gray scale can be processed based on a linear interpolation algorithm to obtain the data voltage compensation amount of the second color sub-pixel in each sub-display area during other gray scales.

Fig. 5 is another schematic flow chart of a brightness compensation method of a display panel according to an embodiment of the present disclosure. As shown in fig. 5, according to some embodiments of the present application, optionally, before the step S103 of acquiring the actual brightness of the plurality of sub-display regions when the display panel displays the second color screen of the target gray scale, the method may further include the following steps S501 to S505.

S501, acquiring actual brightness of a plurality of sub-display areas when the display panel displays a red picture with a preset gray scale and actual brightness of a plurality of sub-display areas when the display panel displays a blue picture with a preset gray scale.

The preset gray scale may be one gray scale or a plurality of gray scales, and may be flexibly adjusted according to actual conditions, which is not limited in the embodiment of the present application. In S501, for example, the display panel first displays a red image with a preset gray scale, and then the optical measurement device collects actual brightness of the sub-display areas when the display panel displays the red image with the preset gray scale. Then, the display panel displays a blue picture with a preset gray scale, and then the actual brightness of the sub-display areas when the display panel displays the blue picture with the preset gray scale is collected through the optical measurement equipment.

S502, calculating a first deviation result of actual brightness of the sub-display areas in the red picture with the preset gray scale and second target brightness corresponding to the preset gray scale, wherein the second target brightness is target brightness of a second color sub-pixel.

Wherein the first deviation result includes, but is not limited to, a standard deviation or a variance. In S502, for example, in a manner the same as or similar to that based on the expression (1) or the expression (2), a standard deviation or a variance between the actual brightness of the sub-display areas and the second target brightness corresponding to the preset gray scale in the red screen with the preset gray scale may be calculated, which is not described herein again.

S503, calculating a second deviation result of the actual brightness of the sub-display areas and a third target brightness corresponding to the preset gray scale when the blue image with the preset gray scale is displayed, wherein the third target brightness is the target brightness of the sub-pixel with the third color.

Wherein the second deviation result includes, but is not limited to, a standard deviation or a variance. In S503, for example, in the same or similar manner as that based on the above expression (1) or the above expression (2), the standard deviation or the variance between the actual luminance of the sub-display areas in the blue image with the preset gray scale and the third target luminance corresponding to the preset gray scale may be calculated, and will not be described herein again.

And S504, when the first deviation result is larger than or equal to the second deviation result, determining the red picture as a second color picture.

And S505, when the first deviation result is smaller than the second deviation result, determining that the blue picture is the second color picture.

Illustratively, for example, when both the first deviation result and the second deviation result are standard deviations, the picture with the largest standard deviation of the red picture and the blue picture is taken as the second color picture. For example, when both the first deviation result and the second deviation result are variances, the picture having the largest variance among the red picture and the blue picture is taken as the second color picture.

Fig. 6 is a schematic flowchart illustrating a luminance compensation method of a display panel according to an embodiment of the present disclosure. In the embodiment shown in FIG. 6, the target gray levels include N gray levels, where N is less than M and N is a positive integer, i.e., the number of gray levels in the target gray levels is less than M. As shown in fig. 6, the method may further include the steps of:

s601, acquiring the actual brightness of a plurality of sub-display areas when the display panel displays a third color picture of the target gray scale.

In S601, the display panel displays the third color frame of the target gray scale, and the actual brightness of each sub-display area is acquired by the optical measurement device, and because only the third color sub-pixels emit light, the acquired actual brightness is the actual brightness of the third color sub-pixels in each sub-display area.

Correspondingly, in S104, determining the data voltage compensation amount corresponding to each sub-display region in at least M gray scales according to the actual brightness of the sub-display regions in the first color screen with M gray scales and the actual brightness of the sub-display regions in the second color screen with the target gray scale, specifically, the method may include the following steps: and determining the corresponding data voltage compensation quantity of each sub-display area in at least M gray scales according to the actual brightness of the sub-display areas in the first color picture of the M gray scales, the actual brightness of the sub-display areas in the second color picture of the target gray scale and the actual brightness of the sub-display areas in the third color picture of the target gray scale.

Fig. 7 is a schematic flowchart of a brightness compensation method for a display panel according to an embodiment of the present disclosure. As shown in fig. 7, specifically, S104 may specifically include the following steps S401 to S408.

S402, determining the data voltage compensation quantity of the first color sub-pixel in each sub-display area at the ith gray scale according to the corresponding relation between the predetermined brightness and the data voltage and the brightness difference of the first color sub-pixel in each sub-display area.

S405, taking the data voltage compensation quantity of the second color sub-pixel in each sub-display area in the target gray scale as the data voltage compensation quantity of the second color sub-pixel in each sub-display area in at least M gray scales.

The steps S401 to S405 are described in detail above, and are not described herein again.

S406, calculating a difference value between the actual brightness of each sub-display area in the third color picture of the target gray scale and a third target brightness corresponding to the target gray scale to obtain a brightness difference of a third color sub-pixel in each sub-display area, wherein the third target brightness is the target brightness of the third color sub-pixel.

When the display panel displays the third color picture of the target gray scale, the actual brightness of each sub-display area can be acquired through optical measurement equipment, and because only the third color sub-pixels emit light, the acquired actual brightness is the actual brightness of the third color sub-pixels in each sub-display area. In addition, a third target brightness corresponding to the third color sub-pixel at the target gray level may also be predetermined. Then, in S406, the actual brightness of each sub-display area at the target gray scale is different from the third target brightness corresponding to the third color sub-pixel at the target gray scale, so as to obtain the brightness difference of the third color sub-pixel in each sub-display area.

S407, determining the data voltage compensation amount of the third color sub-pixel in each sub-display area when the target gray scale is achieved according to the predetermined corresponding relation between the brightness and the data voltage and the brightness difference of the third color sub-pixel in each sub-display area.

In S407, after obtaining the luminance difference of the third color sub-pixel in each sub-display region, the data voltage compensation amount corresponding to the luminance difference may be determined according to the predetermined correspondence relationship between the luminance and the data voltage. Therefore, the data voltage compensation quantity of the third color sub-pixel in each sub-display area during the target gray scale is obtained.

S408, taking the data voltage compensation quantity of the third color sub-pixel in each sub-display area in the target gray scale as the data voltage compensation quantity of the third color sub-pixel in each sub-display area in at least M gray scales.

For example, when the target gray scale has only one gray scale, the data voltage compensation amount of the third color sub-pixel in each sub-display area at the target gray scale can be directly used as the data voltage compensation amount of the third color sub-pixel in each sub-display area at the gray scales of 0-255. When the target gray scale has a plurality of gray scales, the data voltage compensation amount of the third color sub-pixel in each sub-display area during the target gray scale can be processed based on a linear interpolation algorithm to obtain the data voltage compensation amount of the third color sub-pixel in each sub-display area during other gray scales.

For convenience of understanding, the following description will be given with reference to table 2, taking M as 6 and 1 as an example of the target gray level.

TABLE 2

As can be seen from table 2, in the related art, it takes 54 seconds to shoot 18 frames in total for 6 gray-scale shots of three colors of red, green and blue with low, medium and high brightness. In some embodiments of the present application, only the first color picture with 6 gray scales, the second color picture with 1 gray scale, and the third color picture with 1 gray scale need to be photographed for 24 seconds, and the compensation effect is similar to that of the related art, so that the number of pictures photographed in the DeMura process can be reduced, the photographing time can be shortened, and the time and cost spent in the DeMura process can be reduced.

According to some embodiments of the present application, optionally, the first color picture comprises a green picture, and the second color picture comprises any one of a red picture or a blue picture. Illustratively, for example, the second color picture is a blue picture and the third color picture is a red picture.

Based on the brightness compensation method of the display panel provided by the above embodiment, correspondingly, the present application further provides a specific implementation manner of the brightness compensation device of the display panel. Please see the examples below.

As shown in fig. 8, the brightness compensation apparatus 80 of the display panel provided in the embodiment of the present application includes the following modules:

a first obtaining module 801, configured to obtain actual brightness of a plurality of sub-display regions when a display panel displays a first color picture with M different gray scales, where M is an integer greater than 1;

a first determining module 802, configured to determine a target gray scale according to a deviation result between actual brightness of a plurality of sub-display areas in a first color screen with M gray scales and first target brightness corresponding to the M gray scales, where the first target brightness is target brightness of a first color sub-pixel;

a second obtaining module 803, configured to obtain actual brightness of the multiple sub-display regions when the display panel displays a second color screen of the target gray scale;

the second determining module 804 is configured to determine a data voltage compensation amount corresponding to each sub-display region in at least M gray scales according to actual brightness of the sub-display regions in the first color picture of the M gray scales and actual brightness of the sub-display regions in the second color picture of the target gray scale.

In the brightness compensation apparatus for a display panel according to the embodiment of the present application, the first obtaining module 801 is configured to obtain actual brightness of a plurality of sub-display areas when the display panel displays a first color picture with M different gray scales, where M is an integer greater than 1; the first determining module 802 is configured to determine a target gray scale according to deviation results of actual luminances of a plurality of sub display areas in a first color picture with M gray scales and first target luminances corresponding to the M gray scales, where the first target luminance is a target luminance of a first color sub-pixel; the second obtaining module 803 is configured to obtain actual brightness of the plurality of sub-display regions when the display panel displays a second color screen of the target gray scale; the second determining module 804 is configured to determine a data voltage compensation amount corresponding to each sub-display region in at least M gray scales according to actual brightness of the sub-display regions in the first color picture of the M gray scales and actual brightness of the sub-display regions in the second color picture of the target gray scale. On one hand, the first color sub-pixel with larger brightness influence still adopts a plurality of first color pictures with different gray scales to carry out DeMura compensation, so that better DeMura compensation effect can be ensured. On the other hand, the target gray scale is determined by analyzing the brightness deviation result of the first color picture with M gray scales, the DeMura compensation is carried out on the second color picture of the second color sub-pixel with smaller brightness influence by adopting a small amount of target gray scale, and/or the third color picture of the third color sub-pixel with smaller brightness influence is not shot, so that the number of pictures shot in the DeMura process can be reduced, the shooting time is shortened, and the time and the cost spent in the DeMura process can be reduced.

In some embodiments, the brightness compensation apparatus 80 of the display panel according to the embodiment of the present application may further include a third obtaining module, configured to obtain actual brightness of the plurality of sub-display areas when the display panel displays the third color screen of the target gray scale. The second determining module 804 is specifically configured to determine, according to actual brightness of the plurality of sub-display regions in the first color screen of the M gray scales, actual brightness of the plurality of sub-display regions in the second color screen of the target gray scale, and actual brightness of the plurality of sub-display regions in the third color screen of the target gray scale, a data voltage compensation amount corresponding to each sub-display region in at least the M gray scales; the target gray scale comprises N gray scales, wherein N is smaller than M and is a positive integer.

In some embodiments, the first determining module 802 is specifically configured to, for any ith gray scale in the M gray scales, calculate a standard deviation or a variance between actual brightness of the sub-display areas in the first color screen of the ith gray scale and first target brightness corresponding to the ith gray scale; and according to the sorting from large to small, taking the gray scales corresponding to the first Q standard deviations or variances as target gray scales, wherein Q is not more than M and is an integer.

In some embodiments, Q is 1.

In some embodiments, the standard deviation of the actual luminance of the sub-display areas at the time of the first color screen at the ith gray scale and the first target luminance corresponding to the ith gray scale is calculated according to the following expression:

the first target brightness corresponding to the ith gray scale is represented.

In some embodiments, the variance of the actual luminance of the plurality of sub-display areas at the time of the first color screen at the ith gray scale and the first target luminance corresponding to the ith gray scale is calculated according to the following expression:

the first target brightness corresponding to the ith gray scale is represented.

In some embodiments, the second determining module 804 is specifically configured to, for any ith gray scale in the M gray scales, calculate a difference value between actual brightness of each sub-display area in the first color screen of the ith gray scale and first target brightness corresponding to the ith gray scale, to obtain a brightness difference of a first color sub-pixel in each sub-display area; determining the data voltage compensation quantity of the first color sub-pixel in each sub-display area at the ith gray scale according to the predetermined corresponding relation between the brightness and the data voltage and the brightness difference of the first color sub-pixel in each sub-display area; calculating the difference value between the actual brightness of each sub-display area in the second color picture of the target gray scale and the second target brightness corresponding to the target gray scale to obtain the brightness difference of the second color sub-pixels in each sub-display area, wherein the second target brightness is the target brightness of the second color sub-pixels; determining the data voltage compensation quantity of the second color sub-pixels in each sub-display area when the target gray scale is achieved according to the predetermined corresponding relation between the brightness and the data voltage and the brightness difference of the second color sub-pixels in each sub-display area; and taking the data voltage compensation quantity of the second color sub-pixel in each sub-display area in the target gray scale as the data voltage compensation quantity of the second color sub-pixel in each sub-display area in at least M gray scales.

In some embodiments, the brightness compensation apparatus 80 of the display panel according to the embodiment of the present application may further include a third determining module, configured to obtain actual brightness of the plurality of sub-display regions when the display panel displays a red image with a preset gray scale and actual brightness of the plurality of sub-display regions when the display panel displays a blue image with a preset gray scale; calculating a first deviation result of actual brightness of a plurality of sub-display areas in a red picture with a preset gray scale and second target brightness corresponding to the preset gray scale, wherein the second target brightness is the target brightness of a second color sub-pixel; calculating a second deviation result of the actual brightness of the plurality of sub-display areas when the blue picture with the preset gray scale is displayed and a third target brightness corresponding to the preset gray scale, wherein the third target brightness is the target brightness of a third color sub-pixel; when the first deviation result is larger than or equal to the second deviation result, determining the red picture as a second color picture; and when the first deviation result is smaller than the second deviation result, determining the blue picture as a second color picture.

In some embodiments, the first color frame includes a green frame, the second color frame includes either a red frame or a blue frame, and the target gray level includes M gray levels.

Each module/unit in the apparatus shown in fig. 8 has a function of implementing each step in fig. 2, and can achieve the corresponding technical effect, and for brevity, the description is not repeated here.

Based on the brightness compensation method of the display panel provided by the embodiment, correspondingly, the application further provides a specific implementation manner of the electronic device. Please see the examples below.

Fig. 9 shows a hardware structure diagram of an electronic device provided in an embodiment of the present application.

The electronic device may comprise a processor 901 and a memory 902 storing computer program instructions.

Specifically, the processor 901 may include a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement the embodiments of the present Application.

Memory 902 may include mass storage for data or instructions. By way of example, and not limitation, memory 902 may include a Hard Disk Drive (HDD), floppy Disk Drive, flash memory, optical Disk, magneto-optical Disk, tape, or Universal Serial Bus (USB) Drive or a combination of two or more of these. In one example, the memory 902 may include removable or non-removable (or fixed) media, or the memory 902 may be non-volatile solid-state memory. The memory 902 may be internal or external to the integrated gateway disaster recovery device.

In one example, the Memory 902 may be a Read Only Memory (ROM). In one example, the ROM may be mask programmed ROM, programmable ROM (prom), erasable prom (eprom), electrically erasable prom (eeprom), electrically rewritable ROM (earom), or flash memory, or a combination of two or more of these.

Memory 902 may include Read Only Memory (ROM), Random Access Memory (RAM), magnetic disk storage media devices, optical storage media devices, flash memory devices, electrical, optical, or other physical/tangible memory storage devices. Thus, in general, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software comprising computer-executable instructions and when the software is executed (e.g., by one or more processors), it is operable to perform operations described with reference to the methods according to an aspect of the application.

The processor 901 reads and executes the computer program instructions stored in the memory 902 to implement the methods/steps S101 to S104 in the embodiment shown in fig. 2, and achieve the corresponding technical effects achieved by the embodiment shown in fig. 2 executing the methods/steps thereof, which are not described herein again for brevity.

In one example, the electronic device can also include a communication interface 903 and a bus 910. As shown in fig. 9, the processor 901, the memory 902, and the communication interface 903 are connected via a bus 910 to complete communication with each other.

The communication interface 903 is mainly used for implementing communication between modules, apparatuses, units, and/or devices in this embodiment.

The bus 910 includes hardware, software, or both to couple the components of the electronic device to each other. By way of example, and not limitation, a Bus may include an Accelerated Graphics Port (AGP) or other Graphics Bus, an Enhanced Industry Standard Architecture (EISA) Bus, a Front-Side Bus (Front Side Bus, FSB), a HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) Bus, an InfiniBand interconnect, a Low Pin Count (LPC) Bus, a memory Bus, a Micro Channel Architecture (MCA) Bus, a Peripheral Component Interconnect (PCI) Bus, a PCI-Express (PCI-X) Bus, a Serial Advanced Technology Attachment (SATA) Bus, a video electronics standards Association local (VLB) Bus, or other suitable Bus or a combination of two or more of these. Bus 910 can include one or more buses, where appropriate. Although specific buses are described and shown in the embodiments of the application, any suitable buses or interconnects are contemplated by the application.

In addition, in combination with the brightness compensation method of the display panel in the foregoing embodiments, the embodiments of the present application may provide a computer-readable storage medium to implement the method. The computer readable storage medium having stored thereon computer program instructions; the computer program instructions, when executed by a processor, implement a brightness compensation method for a display panel of any of the above embodiments. Examples of computer readable storage media include non-transitory computer readable storage media such as electronic circuits, semiconductor memory devices, ROMs, random access memories, flash memories, erasable ROMs (eroms), floppy disks, CD-ROMs, optical disks, and hard disks.

It is to be understood that the present application is not limited to the particular arrangements and instrumentality described above and shown in the attached drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present application are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications, and additions or change the order between the steps after comprehending the spirit of the present application.

The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic Circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of the present application are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.

It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, the present application is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.

Aspects of the present application are described above with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions/acts specified in the flowchart and/or block diagram block or blocks. Such a processor may be, but is not limited to, a general purpose processor, a special purpose processor, an application specific processor, or a field programmable logic circuit. It will also be understood that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware for performing the specified functions or acts, or combinations of special purpose hardware and computer instructions.

As described above, only the specific embodiments of the present application are provided, and it can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the module and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present application, and these modifications or substitutions should be covered within the scope of the present application.

Claims

1. A method for compensating brightness of a display panel, wherein a display area of the display panel comprises a plurality of sub-display areas, the method comprising:

acquiring actual brightness of a plurality of sub-display areas when the display panel displays M first color pictures with different gray scales, wherein M is an integer larger than 1;

determining a target gray scale according to the deviation result of the actual brightness of the sub-display areas and first target brightness corresponding to the M gray scales respectively when the M gray scale first color images are displayed, wherein the first target brightness is the target brightness of a first color sub-pixel;

acquiring the actual brightness of the sub-display areas when the display panel displays the second color picture of the target gray scale;

and determining the data voltage compensation amount corresponding to each sub-display area in at least M gray scales according to the actual brightness of the sub-display areas in the first color picture of the M gray scales and the actual brightness of the sub-display areas in the second color picture of the target gray scale.

2. The method of claim 1, further comprising:

acquiring the actual brightness of the sub-display areas when the display panel displays a third color picture of the target gray scale;

the determining, according to actual luminances of the sub display areas in the first color picture of the M gray scales and actual luminances of the sub display areas in the second color picture of the target gray scale, a data voltage compensation amount corresponding to each of the sub display areas in at least the M gray scales specifically includes:

determining data voltage compensation quantity corresponding to each sub-display area when the sub-display areas are at least M gray scales according to the actual brightness of the sub-display areas when the first color picture of the M gray scales is displayed, the actual brightness of the sub-display areas when the second color picture of the target gray scale is displayed and the actual brightness of the sub-display areas when the third color picture of the target gray scale is displayed;

the target gray scale comprises N gray scales, wherein N is smaller than M and is a positive integer.

3. The method according to claim 1, wherein the determining a target gray scale according to a deviation result of actual luminances of the sub display regions in a first color screen of the M gray scales and first target luminances corresponding to the M gray scales respectively comprises:

calculating the standard deviation or variance of the actual brightness of the sub-display areas and the first target brightness corresponding to the ith gray scale when the first color picture of the ith gray scale is displayed for any ith gray scale in the M gray scales;

according to the sorting from big to small, taking the gray scales corresponding to the Q standard deviations or the variances before the sorting as the target gray scale, wherein Q is not more than M and is an integer;

preferably, Q is 1.

4. The method according to claim 3, wherein the standard deviation of the actual luminance of the sub-display areas at the first color screen of the ith gray scale and the first target luminance corresponding to the ith gray scale is calculated according to the following expression:

wherein σ represents the standard deviation, N represents the number of the sub-display regions in the display panel, and x _j The actual brightness of the jth sub-display area in the first color picture representing the ith gray scale,

and representing the first target brightness corresponding to the ith gray scale.

5. The method according to claim 3, wherein the variance of the actual luminance of the plurality of sub-display areas at the time of the first color screen of the ith gray scale and the first target luminance corresponding to the ith gray scale is calculated according to the following expression:

wherein s is ² Representing the variance, N representing the number of sub-display regions in the display panel, x ₁ 、x ₂ 、x ₃ And x _N Actual brightness of the 1 st, 2 nd, 3 rd and nth sub-display regions respectively representing the first color picture of the ith gray scale,

6. The method according to claim 1, wherein determining the data voltage compensation amount corresponding to at least M gray levels of each of the sub-display regions according to the actual brightness of the sub-display regions in the first color picture of the M gray levels and the actual brightness of the sub-display regions in the second color picture of the target gray level comprises:

for any ith gray scale in the M gray scales, calculating a difference value between the actual brightness of each sub-display area in the first color picture of the ith gray scale and the first target brightness corresponding to the ith gray scale to obtain the brightness difference of the first color sub-pixels in each sub-display area;

determining the data voltage compensation quantity of the first color sub-pixel in each sub-display area during the ith gray scale according to the predetermined corresponding relation between the brightness and the data voltage and the brightness difference of the first color sub-pixel in each sub-display area;

calculating the difference value between the actual brightness of each sub-display area in the second color picture of the target gray scale and the second target brightness corresponding to the target gray scale to obtain the brightness difference of the second color sub-pixels in each sub-display area, wherein the second target brightness is the target brightness of the second color sub-pixels;

determining the data voltage compensation quantity of the second color sub-pixels in each sub-display area when the target gray scale is achieved according to the corresponding relation between the predetermined brightness and the data voltage and the brightness difference of the second color sub-pixels in each sub-display area;

and taking the data voltage compensation quantity of the second color sub-pixel in each sub-display area when the target gray scale is obtained as the data voltage compensation quantity of the second color sub-pixel in each sub-display area when at least M gray scales are obtained.

7. The method of claim 1, wherein before obtaining actual brightness of the plurality of sub-display regions when the display panel displays the second color screen of the target gray scale, the method further comprises:

acquiring actual brightness of the sub-display areas when the display panel displays a red picture with a preset gray scale and actual brightness of the sub-display areas when the display panel displays a blue picture with the preset gray scale;

calculating a first deviation result of actual brightness of the sub-display areas in the red picture with the preset gray scale and second target brightness corresponding to the preset gray scale, wherein the second target brightness is target brightness of a second color sub-pixel;

calculating a second deviation result of actual brightness of the sub-display areas in the blue picture with the preset gray scale and third target brightness corresponding to the preset gray scale, wherein the third target brightness is target brightness of a third color sub-pixel;

when the first deviation result is greater than or equal to the second deviation result, determining that the red picture is the second color picture;

and when the first deviation result is smaller than the second deviation result, determining the blue picture as the second color picture.

8. The method of claim 1, wherein the first color frame comprises a green frame, the second color frame comprises either a red frame or a blue frame, and the target gray level comprises M gray levels.

9. An apparatus for compensating brightness of a display panel, wherein a display area of the display panel includes a plurality of sub-display areas, the apparatus comprising:

the first acquisition module is used for acquiring the actual brightness of a plurality of sub-display areas when the display panel displays M first color pictures with different gray scales, wherein M is an integer larger than 1;

the first determining module is used for determining a target gray scale according to a deviation result of actual brightness of a plurality of sub display areas and first target brightness corresponding to the M gray scales when a first color picture with the M gray scales is displayed, wherein the first target brightness is target brightness of a first color sub pixel;

the second acquisition module is used for acquiring the actual brightness of the sub-display areas when the display panel displays the second color picture of the target gray scale;

and the second determining module is used for determining the corresponding data voltage compensation quantity of each sub-display area when at least M gray scales exist according to the actual brightness of the sub-display areas when the M gray scales exist in the first color picture and the actual brightness of the sub-display areas when the target gray scale exists in the second color picture.

10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method of luminance compensation of a display panel according to any one of claims 1 to 8.